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I had this same question, as I'd received a coupon from Turbo Tax in the mail for filing before April 1st. It was NOT AT ALL obvious how to apply this discount, and Turbo Tax has incorrect/misleading information on their help page. When I searched under help for "how to apply discount" and "how to apply coupon," the only thing relevant that popped up was "how to apply service code," which informed me that service codes are given by "Support Specialists" and are NOT the same thing as discounts and coupons. As my coupon came in the mail and was not given by a Support Specialist, I assumed this didn't apply to me. However, as I couldn't find any information concerning discounts or coupons, I tried following the instructions below, and it WORKED, applying a 20% discount to my order. What makes me so mad is that the place to click "I have a service code" was really hard to find, not offered at check out, and that there is misinformation in the help desk.